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[arch-security] [ASA-201503-24] vorbis-tools: denial of service
by Levente Polyak 25 Mar '15

25 Mar '15

Arch Linux Security Advisory ASA-201503-24 ========================================== Severity: Low Date : 2015-03-25 CVE-ID : CVE-2014-9638 CVE-2014-9639 CVE-2014-9640 Package : vorbis-tools Type : denial of service Remote : No Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package vorbis-tools before version 1.4.0-5 is vulnerable to denial of service. Resolution ========== Upgrade to 1.4.0-5. # pacman -Syu "vorbis-tools>=1.4.0-5" The problems have been fixed upstream but no release is available yet. Workaround ========== None. Description =========== - CVE-2014-9638 (denial of service) A flaw in oggenc allows attackers to cause a denial of service (divide-by-zero error and crash) via a WAV file with the number of channels set to zero. - CVE-2014-9639 (denial of service) Integer overflow in oggenc allows attackers to cause a denial of service (crash) via a crafted number of channels in a WAV file, which triggers an out-of-bounds memory access. - CVE-2014-9640 (denial of service) A flaw in oggenc/oggenc.c allows attackers to cause a denial of service (out-of-bounds read) via a crafted raw file. Impact ====== An attacker is able to use a specially crafted file that is leading to application crash resulting in denial of service when processed by oggenc. References ========== http://www.openwall.com/lists/oss-security/2015/01/22/9 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-9638 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-9639 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-9640 https://bugs.archlinux.org/task/44172

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[arch-security] [ASA-201503-23] util-linux: command injection
by Levente Polyak 24 Mar '15

24 Mar '15

Arch Linux Security Advisory ASA-201503-23 ========================================== Severity: Medium Date : 2015-03-24 CVE-ID : CVE-2014-9114 Package : util-linux Type : command injection Remote : No Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package util-linux before version 2.26.1-3 is vulnerable to command injection via malicious devices. Resolution ========== Upgrade to 2.26.1-3. # pacman -Syu "util-linux>=2.26.1-3" The problem has been fixed upstream in version 2.26. Workaround ========== None. Description =========== There is a command injection inside blkid. It uses caching files (/dev/.blkid.tab or /run/blkid/blkid.tab) to store info about the UUID, LABEL etc it finds on certain devices. However, it does not strip " character, so it can be confused to build variable names containing embedded shell metas, which it would usually encode inside the value. Impact ====== An attacker is able to use a specially prepared device with a malicious label to potentially inject arbitrary shell commands when mounted with a wrapper that uses 'blkid -o' passed to eval. References ========== http://seclists.org/oss-sec/2014/q4/811 https://access.redhat.com/security/cve/CVE-2014-9114 https://bugs.archlinux.org/task/43886

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[arch-security] [ASA-201503-22] cpio: directory traversal
by Levente Polyak 23 Mar '15

23 Mar '15

Arch Linux Security Advisory ASA-201503-22 ========================================== Severity: Low Date : 2015-03-23 CVE-ID : CVE-2015-1197 Package : cpio Type : directory traversal Remote : No Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package cpio before version 2.11-6 is vulnerable to directory traversal. Resolution ========== Upgrade to 2.11-6. # pacman -Syu "cpio>=2.11-6" The problem has not been fixed upstream but patches were available. Workaround ========== None. Description =========== It was reported that cpio is vulnerable to a directory traversal vulnerability when using the --no-absolute-filenames option. While extracting an archive, it will extract symlinks and then follow them if they are referenced in further entries. This can be exploited by a rogue archive to write to files outside the current directory. Impact ====== An attacker is able to use a specially crafted archive containing a symlink to perform directory traversal resulting in arbitrary file write. References ========== https://lists.gnu.org/archive/html/bug-cpio/2015-01/msg00000.html https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-1197 https://bugs.archlinux.org/task/44173

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[arch-security] [ASA-201503-21] firefox: multiple issues
by Remi Gacogne 21 Mar '15

21 Mar '15

Arch Linux Security Advisory ASA-201503-21 ========================================== Severity: Critical Date : 2015-03-21 CVE-ID : CVE-2015-0817 CVE-2015-0818 Package : firefox Type : multiple issues Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package firefox before version 36.0.3-1 is vulnerable to multiple issues, including same-origin policy bypass and arbitrary remote code execution. Resolution ========== Upgrade to 36.0.3-1. # pacman -Syu "firefox>=36.0.3-1" The problem has been fixed upstream in version 36.0.3. Workaround ========== None. Description =========== - CVE-2015-0817 (arbitrary remote code execution): Security researcher ilxu1a reported, through HP Zero Day Initiative's Pwn2Own contest, a flaw in Mozilla's implementation of typed array bounds checking in JavaScript just-in-time compilation (JIT) and its management of bounds checking for heap access. This flaw can be leveraged into the reading and writing of memory allowing for arbitary code execution on the local system. - CVE-2015-0818 (same-origin policy bypass): Security researcher Mariusz Mlynski reported, through HP Zero Day Initiative's Pwn2Own contest, a method to run arbitrary scripts in a privileged context. This bypassed the same-origin policy protections by using a flaw in the processing of SVG format content navigation. Impact ====== A remote attacker can bypass the same-origin policy or execute arbitrary code with the privilege of the browser. References ========== https://www.mozilla.org/en-US/security/advisories/mfsa2015-28/ https://www.mozilla.org/en-US/security/advisories/mfsa2015-29/

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[arch-security] [ASA-201503-20] tcpdump: multiple issues
by Levente Polyak 20 Mar '15

20 Mar '15

Arch Linux Security Advisory ASA-201503-20 ========================================== Severity: High Date : 2015-03-20 CVE-ID : CVE-2014-8767 CVE-2014-8768 CVE-2014-8769 CVE-2014-9140 CVE-2015-0261 CVE-2015-2153 CVE-2015-2154 CVE-2015-2155 Package : tcpdump Type : multiple issues Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package tcpdump before version 4.7.3-1 is vulnerable to multiple issues including denial of service, out-of-bounds memory read and possibly arbitrary code execution. Resolution ========== Upgrade to 4.7.3-1. # pacman -Syu "tcpdump>=4.7.3-1" The problems have been fixed upstream in version 4.7.3. Workaround ========== None. Description =========== - CVE-2014-8767 (denial of service) Integer underflow in the olsr_print function when in verbose mode, allows remote attackers to cause a denial of service (crash) via a crafted length value in an OLSR frame. - CVE-2014-8768 (denial of service) Multiple Integer underflows in the geonet_print function, when in verbose mode, allow remote attackers to cause a denial of service (segmentation fault and crash) via a crafted length value in a Geonet frame. - CVE-2014-8769 (out-of-bounds memory read) Might allow remote attackers to obtain sensitive information from memory or cause a denial of service (packet loss or segmentation fault) via a crafted Ad hoc On-Demand Distance Vector (AODV) packet, which triggers an out-of-bounds memory access. - CVE-2014-9140 (denial of service) Buffer overflow in the ppp_hdlc function in print-ppp.c allows remote attackers to cause a denial of service (crash) cia a crafted PPP packet or possibly execute arbitrary code. - CVE-2015-0261 (out-of-bounds memory read) IPv6 mobility printer mobility_opt_print() typecastimg/signedness error would handle "len" as "int" (=positive and negative numbers), instead of "unsigned int" (=only positive numbers). When calling mobility_opt_print() with a negative "len", the "i < len" check would not be satisfied and it would not enter the loop and try to read from bp[i]. - CVE-2015-2153 (arbitrary code execution) TCP printer problem with missing length check in the rpki_rtr_pdu_print() function in print-rpki-rtr.c when processing RPKI-RTR PDUs (Protocol Data Units) with an incorrect header length. Without this check, the function will try to operate on invalid data when processing certain packets, leading to all kinds of unwanted side effects, including crashes due to invalid reads, writes and general memory corruption. Due to the memory corruption aspect it may lead to code execution. - CVE-2015-2154 (out-of-bounds memory read) Ethernet printer osi_print_cksum() missing sanity checks in print-isoclns.c. The function may call the create_osi_cksum() function in checksum.c with invalid data leading to out-of-bounds memory read. - CVE-2015-2155 (arbitrary code execution) A flaw was found in tcpdump's force printer. A remote attacker could use this flaw to cause tcpdump to crash, resulting in a denial of service, or possibly execute arbitrary code. Impact ====== A remote attacker is able to inject specially crafted packets that cause tcpdump to crash leading to denial of service, or possibly execute arbitrary code via various vectors. References ========== https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-8767 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-8768 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-8769 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-9140 https://access.redhat.com/security/cve/CVE-2015-0261 https://access.redhat.com/security/cve/CVE-2015-2153 https://access.redhat.com/security/cve/CVE-2015-2154 https://access.redhat.com/security/cve/CVE-2015-2155 https://bugs.archlinux.org/task/44153

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[arch-security] [ASA-201503-19] xerces-c: denial of service
by Levente Polyak 20 Mar '15

20 Mar '15

Arch Linux Security Advisory ASA-201503-19 ========================================== Severity: Medium Date : 2015-03-20 CVE-ID : CVE-2015-0252 Package : xerces-c Type : denial of service Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package xerces-c before version 3.1.2-1 is vulnerable to denial of service. Resolution ========== Upgrade to 3.1.2-1. # pacman -Syu "xerces-c>=3.1.2-1" The problem has been fixed upstream in version 3.1.2. Workaround ========== None. Description =========== - CVE-2015-0252 (denial of service) The Xerces-C XML parser mishandles certain kinds of malformed input documents, resulting in a segmentation fault during a parse operation. The bug does not appear to allow for remote code execution, but is a denial of service attack that in many applications may allow for an unauthenticated attacker to supply malformed input and cause a crash. Impact ====== A remote attacker is able to send specially crafted documents that are resulting in a segmentation fault leading to denial of service. References ========== https://xerces.apache.org/xerces-c/secadv/CVE-2015-0252.txt https://access.redhat.com/security/cve/CVE-2015-0252 https://bugs.archlinux.org/task/44272

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[arch-security] [ASA-201503-18] drupal: multiple issues
by Levente Polyak 20 Mar '15

20 Mar '15

Arch Linux Security Advisory ASA-201503-18 ========================================== Severity: Medium Date : 2015-03-20 CVE-ID : CVE-2015-2559 Package : drupal Type : multiple issues Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package drupal before version 7.35-1 is vulnerable to access bypass and open redirects. Resolution ========== Upgrade to 7.35-1. # pacman -Syu "drupal>=7.35-1" The problems have been fixed upstream in version 7.35. Workaround ========== None. Description =========== - CVE-2015-2559 (access bypass) Password reset URLs can be forged under certain circumstances, allowing an attacker to gain access to another user's account without knowing the account's password. In Drupal 7, this vulnerability is mitigated by the fact that it can only be exploited on sites where accounts have been imported or programmatically edited in a way that results in the password hash in the database being the same for multiple user accounts. - None (open redirect) Under certain circumstances, malicious users can use the destination URL parameter to construct a URL that will trick users into being redirected to a 3rd party website, thereby exposing the users to potential social engineering attacks. Impact ====== A remote attacker may gain access to another user's account or take advantage of open redirect issues to trick users into being redirected to a 3rd party website. References ========== https://www.drupal.org/SA-CORE-2015-001 http://www.openwall.com/lists/oss-security/2015/03/20/2 https://security-tracker.debian.org/tracker/CVE-2015-2559

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[arch-security] [ASA-201503-17] lib32-openssl: multiple issues
by Levente Polyak 19 Mar '15

19 Mar '15

Arch Linux Security Advisory ASA-201503-17 ========================================== Severity: High Date : 2015-03-19 CVE-ID : CVE-2015-1787 CVE-2015-0207 CVE-2015-0208 CVE-2015-0209 CVE-2015-0285 CVE-2015-0286 CVE-2015-0287 CVE-2015-0288 CVE-2015-0289 CVE-2015-0290 CVE-2015-0291 CVE-2015-0293 Package : lib32-openssl Type : multiple issues Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package lib32-openssl before version 1.0.2.a-1 is vulnerable to multiple issues including but not limited to denial of service, unseeded PRNG and memory corruption. Resolution ========== Upgrade to 1.0.2.a-1. # pacman -Syu "lib32-openssl>=1.0.2.a-1" The problems have been fixed upstream in version 1.0.2.a. Workaround ========== None. Description =========== - CVE-2015-1787 (denial of service) If client auth is used then a server can segfault in the event of a DHE ciphersuite being selected and a zero length ClientKeyExchange message being sent by the client. This could be exploited in a DoS attack. - CVE-2015-0207 (denial of service) The DTLSv1_listen function is intended to be stateless and processes the initial ClientHello from many peers. It is common for user code to loop over the call to DTLSv1_listen until a valid ClientHello is received with an associated cookie. A defect in the implementation of DTLSv1_listen means that state is preserved in the SSL object from one invocation to the next that can lead to a segmentation fault. Errors processing the initial ClientHello can trigger this scenario. An example of such an error could be that a DTLS1.0 only client is attempting to connect to a DTLS1.2 only server. - CVE-2015-0208 (denial of service) The signature verification routines will crash with a NULL pointer dereference if presented with an ASN.1 signature using the RSA PSS algorithm and invalid parameters. Since these routines are used to verify certificate signature algorithms this can be used to crash any certificate verification operation and exploited in a DoS attack. Any application which performs certificate verification is vulnerable including OpenSSL clients and servers which enable client authentication. - CVE-2015-0209 (denial of service) A malformed EC private key file consumed via the d2i_ECPrivateKey function could cause a use after free condition. This, in turn, could cause a double free in several private key parsing functions (such as d2i_PrivateKey or EVP_PKCS82PKEY) and could lead to a DoS attack or memory corruption for applications that receive EC private keys from untrusted sources. This scenario is considered rare. - CVE-2015-0285 (unseeded PRNG) Under certain conditions an OpenSSL 1.0.2 client can complete a handshake with an unseeded PRNG. The conditions are: - The client is on a platform where the PRNG has not been seeded automatically, and the user has not seeded manually - A protocol specific client method version has been used (i.e. not SSL_client_methodv23) - A ciphersuite is used that does not require additional random data from the PRNG beyond the initial ClientHello client random (e.g. PSK-RC4-SHA). If the handshake succeeds then the client random that has been used will have been generated from a PRNG with insufficient entropy and therefore the output may be predictable. - CVE-2015-0286 (denial of service) The function ASN1_TYPE_cmp will crash with an invalid read if an attempt is made to compare ASN.1 boolean types. Since ASN1_TYPE_cmp is used to check certificate signature algorithm consistency this can be used to crash any certificate verification operation and exploited in a DoS attack. Any application which performs certificate verification is vulnerable including OpenSSL clients and servers which enable client authentication. - CVE-2015-0287 (memory corruption) Reusing a structure in ASN.1 parsing may allow an attacker to cause memory corruption via an invalid write. Such reuse is and has bee strongly discouraged and is believed to be rare. Applications that parse structures containing CHOICE or ANY DEFINED BY components may be affected. Certificate parsing (d2i_X509 and related functions) are however not affected. OpenSSL clients and servers are not affected. - CVE-2015-0288 (denial of service) The function X509_to_X509_REQ will crash with a NULL pointer dereference if the certificate key is invalid. This function is rarely used in practice. - CVE-2015-0289 (denial of service) The PKCS#7 parsing code does not handle missing outer ContentInfo correctly. An attacker can craft malformed ASN.1-encoded PKCS#7 blobs with missing content and trigger a NULL pointer dereference on parsing. Applications that verify PKCS#7 signatures, decrypt PKCS#7 data or otherwise parse PKCS#7 structures from untrusted sources are affected. OpenSSL clients and servers are not affected. - CVE-2015-0290 (denial of service) OpenSSL 1.0.2 introduced the "multiblock" performance improvement. This feature only applies on 64 bit x86 architecture platforms that support AES NI instructions. A defect in the implementation of "multiblock" can cause OpenSSL's internal write buffer to become incorrectly set to NULL when using non-blocking IO. Typically, when the user application is using a socket BIO for writing, this will only result in a failed connection. However if some other BIO is used then it is likely that a segmentation fault will be triggered, thus enabling a potential DoS attack. - CVE-2015-0291 (denial of service) If a client connects to an OpenSSL 1.0.2 server and renegotiates via ClientHello with an invalid signature algorithms extension a NULL pointer dereference will occur. This can be exploited in a DoS attack against the server. - CVE-2015-0293 (denial of service) A malicious client can trigger an OPENSSL_assert (i.e., an abort) in servers that both support SSLv2 and enable export cipher suites by sending a specially crafted SSLv2 CLIENT-MASTER-KEY message. Impact ====== A remote attacker is able to perform denial of service, memory corruption or possibly take advantage of an unseeded PRNG via various vectors. References ========== https://www.openssl.org/news/secadv_20150319.txt https://access.redhat.com/security/cve/CVE-2015-1787 https://access.redhat.com/security/cve/CVE-2015-0207 https://access.redhat.com/security/cve/CVE-2015-0208 https://access.redhat.com/security/cve/CVE-2015-0209 https://access.redhat.com/security/cve/CVE-2015-0285 https://access.redhat.com/security/cve/CVE-2015-0286 https://access.redhat.com/security/cve/CVE-2015-0287 https://access.redhat.com/security/cve/CVE-2015-0288 https://access.redhat.com/security/cve/CVE-2015-0289 https://access.redhat.com/security/cve/CVE-2015-0290 https://access.redhat.com/security/cve/CVE-2015-0291 https://access.redhat.com/security/cve/CVE-2015-0293 https://bugs.archlinux.org/task/44227

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[arch-security] [ASA-201503-16] openssl: multiple issues
by Levente Polyak 19 Mar '15

19 Mar '15

Arch Linux Security Advisory ASA-201503-16 ========================================== Severity: High Date : 2015-03-19 CVE-ID : CVE-2015-1787 CVE-2015-0207 CVE-2015-0208 CVE-2015-0209 CVE-2015-0285 CVE-2015-0286 CVE-2015-0287 CVE-2015-0288 CVE-2015-0289 CVE-2015-0290 CVE-2015-0291 CVE-2015-0293 Package : openssl Type : multiple issues Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package openssl before version 1.0.2.a-1 is vulnerable to multiple issues including but not limited to denial of service, unseeded PRNG and memory corruption. Resolution ========== Upgrade to 1.0.2.a-1. # pacman -Syu "openssl>=1.0.2.a-1" The problems have been fixed upstream in version 1.0.2.a. Workaround ========== None. Description =========== - CVE-2015-1787 (denial of service) If client auth is used then a server can segfault in the event of a DHE ciphersuite being selected and a zero length ClientKeyExchange message being sent by the client. This could be exploited in a DoS attack. - CVE-2015-0207 (denial of service) The DTLSv1_listen function is intended to be stateless and processes the initial ClientHello from many peers. It is common for user code to loop over the call to DTLSv1_listen until a valid ClientHello is received with an associated cookie. A defect in the implementation of DTLSv1_listen means that state is preserved in the SSL object from one invocation to the next that can lead to a segmentation fault. Errors processing the initial ClientHello can trigger this scenario. An example of such an error could be that a DTLS1.0 only client is attempting to connect to a DTLS1.2 only server. - CVE-2015-0208 (denial of service) The signature verification routines will crash with a NULL pointer dereference if presented with an ASN.1 signature using the RSA PSS algorithm and invalid parameters. Since these routines are used to verify certificate signature algorithms this can be used to crash any certificate verification operation and exploited in a DoS attack. Any application which performs certificate verification is vulnerable including OpenSSL clients and servers which enable client authentication. - CVE-2015-0209 (denial of service) A malformed EC private key file consumed via the d2i_ECPrivateKey function could cause a use after free condition. This, in turn, could cause a double free in several private key parsing functions (such as d2i_PrivateKey or EVP_PKCS82PKEY) and could lead to a DoS attack or memory corruption for applications that receive EC private keys from untrusted sources. This scenario is considered rare. - CVE-2015-0285 (unseeded PRNG) Under certain conditions an OpenSSL 1.0.2 client can complete a handshake with an unseeded PRNG. The conditions are: - The client is on a platform where the PRNG has not been seeded automatically, and the user has not seeded manually - A protocol specific client method version has been used (i.e. not SSL_client_methodv23) - A ciphersuite is used that does not require additional random data from the PRNG beyond the initial ClientHello client random (e.g. PSK-RC4-SHA). If the handshake succeeds then the client random that has been used will have been generated from a PRNG with insufficient entropy and therefore the output may be predictable. - CVE-2015-0286 (denial of service) The function ASN1_TYPE_cmp will crash with an invalid read if an attempt is made to compare ASN.1 boolean types. Since ASN1_TYPE_cmp is used to check certificate signature algorithm consistency this can be used to crash any certificate verification operation and exploited in a DoS attack. Any application which performs certificate verification is vulnerable including OpenSSL clients and servers which enable client authentication. - CVE-2015-0287 (memory corruption) Reusing a structure in ASN.1 parsing may allow an attacker to cause memory corruption via an invalid write. Such reuse is and has bee strongly discouraged and is believed to be rare. Applications that parse structures containing CHOICE or ANY DEFINED BY components may be affected. Certificate parsing (d2i_X509 and related functions) are however not affected. OpenSSL clients and servers are not affected. - CVE-2015-0288 (denial of service) The function X509_to_X509_REQ will crash with a NULL pointer dereference if the certificate key is invalid. This function is rarely used in practice. - CVE-2015-0289 (denial of service) The PKCS#7 parsing code does not handle missing outer ContentInfo correctly. An attacker can craft malformed ASN.1-encoded PKCS#7 blobs with missing content and trigger a NULL pointer dereference on parsing. Applications that verify PKCS#7 signatures, decrypt PKCS#7 data or otherwise parse PKCS#7 structures from untrusted sources are affected. OpenSSL clients and servers are not affected. - CVE-2015-0290 (denial of service) OpenSSL 1.0.2 introduced the "multiblock" performance improvement. This feature only applies on 64 bit x86 architecture platforms that support AES NI instructions. A defect in the implementation of "multiblock" can cause OpenSSL's internal write buffer to become incorrectly set to NULL when using non-blocking IO. Typically, when the user application is using a socket BIO for writing, this will only result in a failed connection. However if some other BIO is used then it is likely that a segmentation fault will be triggered, thus enabling a potential DoS attack. - CVE-2015-0291 (denial of service) If a client connects to an OpenSSL 1.0.2 server and renegotiates via ClientHello with an invalid signature algorithms extension a NULL pointer dereference will occur. This can be exploited in a DoS attack against the server. - CVE-2015-0293 (denial of service) A malicious client can trigger an OPENSSL_assert (i.e., an abort) in servers that both support SSLv2 and enable export cipher suites by sending a specially crafted SSLv2 CLIENT-MASTER-KEY message. Impact ====== A remote attacker is able to perform denial of service, memory corruption or possibly take advantage of an unseeded PRNG via various vectors. References ========== https://www.openssl.org/news/secadv_20150319.txt https://access.redhat.com/security/cve/CVE-2015-1787 https://access.redhat.com/security/cve/CVE-2015-0207 https://access.redhat.com/security/cve/CVE-2015-0208 https://access.redhat.com/security/cve/CVE-2015-0209 https://access.redhat.com/security/cve/CVE-2015-0285 https://access.redhat.com/security/cve/CVE-2015-0286 https://access.redhat.com/security/cve/CVE-2015-0287 https://access.redhat.com/security/cve/CVE-2015-0288 https://access.redhat.com/security/cve/CVE-2015-0289 https://access.redhat.com/security/cve/CVE-2015-0290 https://access.redhat.com/security/cve/CVE-2015-0291 https://access.redhat.com/security/cve/CVE-2015-0293 https://bugs.archlinux.org/task/44227

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[arch-security] [ASA-201503-15] libxfont: multiple issues
by Levente Polyak 17 Mar '15

17 Mar '15

Arch Linux Security Advisory ASA-201503-15 ========================================== Severity: Critical Date : 2015-03-17 CVE-ID : CVE-2015-1802 CVE-2015-1803 CVE-2015-1804 Package : libxfont Type : multiple issues Remote : No Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package libxfont before version 1.5.1-1 is vulnerable to multiple issues including denial of service and out-of-bounds memory read/write leading to arbitrary code execution with the privileges of the X server. Resolution ========== Upgrade to 1.5.1-1. # pacman -Syu "libxfont>=1.5.1-1" The problem has been fixed upstream in version 1.5.1. Workaround ========== None. Description =========== As libXfont is used by the X server to read font files, and an unprivileged user with access to the X server can tell the X server to read a given font file from a path of their choosing, these vulnerabilities have the potential to allow unprivileged users to run code with the privileges of the X server (often root access). - CVE-2015-1802 (out-of-bounds memory write) The bdf parser reads a count for the number of properties defined in a font from the font file, and allocates arrays with entries for each property based on that count. It never checked to see if that count was negative, or large enough to overflow when multiplied by the size of the structures being allocated, and could thus allocate the wrong buffer size, leading to out of bounds writes. - CVE-2015-1803 (denial of service) If the bdf parser failed to parse the data for the bitmap for any character, it would proceed with an invalid pointer to the bitmap data and later crash when trying to read the bitmap from that pointer. - CVE-2015-1804 (out-of-bounds memory read) The bdf parser read metrics values as 32-bit integers, but stored them into 16-bit integers. Overflows could occur in various operations leading to out-of-bounds memory access. Impact ====== A local attacker is able to use specially crafted font files to perform denial of service or execute arbitrary code with the privileges of the X server resulting in local privilege escalation. References ========== http://www.openwall.com/lists/oss-security/2015/03/17/5 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1802 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1803 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1804 https://bugs.archlinux.org/task/44226

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